machinery to build ethtool and conntrack

tools/Dockerfile

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+FROM scratch
+MAINTAINER Weaveworks Inc <help@weave.works>
+ADD ./bin /bin

tools/build.sh

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+#!/bin/sh
+set -e
+
+apt-get -y update
+apt-get -y install curl make pkg-config gcc bison flex
+
+BASEDIR=$(dirname $0)
+mkdir -p "$BASEDIR"/bin
+
+# ethtool
+
+ETHTOOL=ethtool-3.16
+
+rm -rf $ETHTOOL
+
+curl -s -S https://www.kernel.org/pub/software/network/ethtool/$ETHTOOL.tar.gz | tar xvz
+(cd $ETHTOOL; ./configure LDFLAGS=-static; make)
+cp $ETHTOOL/ethtool "$BASEDIR"/bin/
+
+# conntrack
+
+PACKAGES="libmnl-1.0.3 libnfnetlink-1.0.1 libnetfilter_cttimeout-1.0.0 libnetfilter_cthelper-1.0.0 libnetfilter_queue-1.0.2 libnetfilter_conntrack-1.0.4"
+CONNTRACK=conntrack-tools-1.4.2
+
+rm -rf $PACKAGES $CONNTRACK
+
+fetch() {
+    curl -s -S http://www.netfilter.org/projects/${1%-*}/files/$1.tar.bz2 | tar xj
+}
+
+for PACKAGE in $PACKAGES; do
+    fetch $PACKAGE
+    (cd $PACKAGE; ./configure && make LDFLAGS=-static install)
+done
+
+fetch $CONNTRACK
+(cd $CONNTRACK; ./configure && make LDFLAGS=-static && rm -f src/conntrack && make LDFLAGS=-all-static)
+cp $CONNTRACK/src/conntrack "$BASEDIR"/bin/
+
+touch "$BASEDIR"/bin